surrogate

Okay this really pisses me off idk if I'm the only one but it seems when I talk with my little sister about my fertility issues she offers to be a surrogate for me. I've told her before that's not the route I want to go. I've never insinuated that I'd want to go that route. She always brings it up and it pisses me off. I've told her that I want to experience pregnancy myself. Then she tells me how horrible being pregnant is(she has a child) and how she would do it for free. To be honest, I feel like she'd be doing it for attention and wouldn't be able to part with the child afterward not to mention I would be extremely jealous of her for being able to carry my child. It works for some women but definitely not for me. I might sound like a B$@&! For saying it but it's how I feel. Has anyone else ever been in this situation? For me a surrogate would be the absolute last resort if I didn't have a child by 40 (only 24 now) and my surrogate wouldn't be a relative or friend.